* add a man page "systemdall" that lists all of systemd's man pages, inspired by zsh's "zshall" page
* print a nicer explanation if people use variable/specifier expansion in ExecStart= for the first word
* add a man page "systemdall" that lists all of systemd's man pages, inspired by zsh's "zshall" page
* print a nicer explanation if people use variable/specifier expansion in ExecStart= for the first word